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Microsoft Outlook 2000

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Outlook 2000 was included with all versions of Office 2000 (Standard, Professional, Premium and Microsoft Office Developer). It was also available as a standalone product; however, it doesn't journal Office 97 application documents. Microsoft customers who have a valid Exchange Server client access license (CAL) can use Outlook 2000. Outlook 2000 is also included with Microsoft Small Business Server 4.5. See:

Outlook 2000 Support Center

New & Improved Features

OL2000: Summary of New Features Available in Outlook 2000 (MSKB)

First look at Outlook 2000 in our EMO newsletter, one of the most detailed new feature lists

Microsoft Outlook with Exchange Server

System Requirements

This is the official requirements list from Microsoft. If you plan to run other programs or use Word as your e-mail editor, we'd recommend more RAM:

PC with a Pentium 75 MHz or higher processor

Microsoft Windows 95 or later operating system, or Microsoft Windows NT Workstation operating system version 4.0 with Service Pack 3 or later

RAM:

For Windows 95 or Windows 98, 16 MB of RAM for the operating system, plus an additional 8 MB of RAM for Microsoft Outlook

For Microsoft Windows NT Workstation operating system version 4.0 with Service Pack 3 or later, 32 MB of RAM for the operating system, plus an additional 8 MB of RAM for Microsoft Outlook

For Microsoft Windows NT Server operating system version 4.0 with Service Pack 3 or later, 64MB for the operating system, plus an additional 8 MB of RAM for Microsoft Outlook

Available hard-disk space for Typical installation: 153 MB

CD-ROM drive

VGA or higher resolution monitor; Super VGA recommended

Microsoft Mouse, Microsoft Intellimouse, or compatible pointing device

Versions

Check the version number with Help | About. The version number is determined by the version number on the Outllib.dll file. This table lists the versions and the patch that updates Outlook to that version. Major updates are marked with the version number in bold:

	Outllib.dll version
Original	Via retail channels and as on the Exchange Server 5.5 Service Pack 3 CD. The Exchange SP3 version has at least one minor tweak, but does not change the version number.	9.0.0.2711
Email Attachment Security Update	This changes the way attached .exe files are handled when you try to open them from inside a mail message. The idea is to make it harder for something like the Worm.ExploreZip Virus to get through. Be sure to get the right version for your copy of Outlook.	9.0.0.3011
IMO SPA Fix	Fixes problem with IMO mode and Secure Password Authentication in which messages are not being sent immediately.	9.0.0.3120
Attachments Forwarding Hotfix	Fixes a problem in which Outlook was stripping attachments from forwarded messages under certain conditions.	9.0.0.3206
Delegate Meeting Request Fix	Fixes relatively minor problem with delegates not being able to distinguish between required, optional and resource attendees on meeting requests.	9.0.0.3216
Calendar Folder Display Fix	Resolves problem that can occur when a user accesses his or her Calendar folder via Outlook Web Access, then another user tries to open it with the File \| Open \| Other User's Folder command.	9.0.0.3225
Remote Mail Fix	Fixes problem where Remote Mail downloaded headers for deleted items.	9.0.0.3415
COM Add-in Toolbar Fix	Resolves a problem that resulted in duplicate custom menu items on the Standard Explorer menu when a COM add-in is running.	9.0.0.3502
Outlook View Control Fix	Resolves access violation errors that can occur when you use the Outlook View Control from the Team Folders or Digital Dashboard kit on a machine that is also using an Exchange Client Extensions add-in that hooks into the Click event. Updates Outlrpc.dll, Mso9.dll and Lvreg.dll, in addition to Outllib.dll.	9.0.0.3508
Microsoft Outlook 2000 Service Release 1	Major update with dozens of fixes for Outlook 2000, plus new security features to meet the requirements of the Defense Messaging System used by the U.S. government. Available both as download patch and on CD.	9.0.0.3821
FTP Free/Busy Fix	Fixes a problem related to publishing free/busy data via FTP through a proxy server.	9.0.0.3910
Recurring Appointments Fix	Fixes a problem with the Restrict method in programming code that can result in some recurring appointments not being retrieved.	9.0.0.3915
Multi-purpose fix	Allows custom forms to support copy, cut and paste commands. Also fixes several problems related to delegates and appointments. See: OL Cut, Copy, and Paste Commands Do Not Work in a Custom Form OL Outlook May Leave Messages in Your Outbox When Originally Composed by a Delegate OL2000 Meeting Requests Are Not Processed in a Timely Manner OL2000 Attendee Names Are Corrupted When You Exceed the Available Space in the All Attendees Box OL2000 Print Preview Does Not Display Appointments OL2000 Outlook Process Still Running After Clicking Exit and Log Off When Custom Form Is Copied in Category View	9.0.0.4005
Timeline View Fix	Fixes a problem with the timeline view in public calendar folders not refreshing when grouped by Category.	9.0.0.4012
Folder Home Page ActiveX Control Fix	Resolves a problem with folder home pages that use unsigned ActiveX controls.	9.0.0.4019
Outlook Email Security Update	Extensive update to lock down many parts of Outlook that make it possible for a virus to use Outlook to propagate. Install with great caution, since it will change the behavior of some Outlook features and most add-ins.	9.0.0.4201
XCLN Free and Busy Details Not Available When Viewed from Different Time Zones	Fixes problem where Exchange Server free/busy public folder and Outlook clients are on different sides of Greenwich Mean Time.	9.0.0.4207
Toolbar Fix	Resolves several problems with toolbars. See: OL2000 Outlook Quits When You Access a VBA Generated Toolbar OL2000 The Outcmd.dat File Increases When You Add Custom Command Bars	9.0.0.4221
Item_Write fix for Calendar items	Resolves a problem that can prevent Outlook from shutting down after you drag appointments that use custom forms.	9.0.0.4319
Multipurpose fix	Allows you to change the default path for creating new Personal Folders .pst files and fixes a problem with RTF messages saved as drafts. See: XCLN Default Personal Folder File Creation Path Needs to Be Configurable OL2000 Error Message The Messaging Interface Has Returned an Unknown Error	9.0.0.4326
Multipurpose fix	Allows Outlook 2000 Rules Wizard to correctly migrate Outlook 97 Inbox Assistant rules. Also fixes a problem with the Attachment Security Update and some later patches. See: OL2000 Outlook Does Not Migrate Rules When You Upgrade OL2000 The Attachment Security Button Is Missing	9.0.0.4409
OL2000 The IMAP Client Side Rules Fail	Allows Rules Wizard rules to work on IMAP folders in Internet Mail Only mode.	9.0.0.4402
E-mail Security Update update	Update to the E-mail Security Update to block Microsoft Access .mda and .mdz.	9.0.0.4423
Post Reply to Drafts Fix	Fixes a problem in SR-1 that causes replies to posts in public folders to save in the user's Drafts folder. We don't know yet whether it requires the Outlook Email Security Update.	9.0.0.4423
Message Options One-off Fix	Hotfix to prevent custom forms from one-offing when you set voting buttons or other message options. Includes the Outlook Email Security Update.	unknown, but after 9.0.0.4423
Office 2000 Service Pack 2	Major interim release to consolidate the E-mail Security Update, CDO Security Update and various hotfixes listed above, along with other fixes.	9.0.0.4527
OL2000 The NewInspector Event May Not Fire For a Single Occurrence of a Recurring Appointment	Hotfix to correct a problem with the NewInspector event that should fire whenever a new item is displayed.	9.0.0.4604
Multi-purpose hotfix	See: OL2000 Error Message The Messaging Interface Has Returned an Unknown Error OL2000 Mail Item with File Name That Contains Uppercase DBCS Characters Cannot Be Opened from Local File System	9.0.0.4618
CreateItemFromTemplate Fix	Resolves an error that occurs with the CreateItemFromTemplate method.	9.0.0.4625
Distribution List Programming Fix	Makes it possible to add or remove contacts from a distribution list without displaying the list	9.0.0.4702
Custom Meeting Request Fix	Resolves a problem that can cause an error with customized appointment forms sent as meeting requests.	9.0.0.4715
Multipurpose hotfix	See: OL2000 Problem Publishing Calendar Free-Busy Info. from Outlook OL2000 Outlook 2000 Creates Larger Messages Than Outlook 98 OL2000 Files That Are Generated in RTF Display Attachments as Blank Icons	9.0.0.4813
Multipurpose hotfix	See: OL2000 Outlook Stops Responding When You Use the SHIFT Key to Select the 122nd Entry in an Address Book OL2000 You Cannot Access a Custom Form If You Use the Outlook Object Model	9.0.0.4924
OL2000 Error Message The Name or Distribution List Has Been Deleted and Is No Longer Valid		9.0.0.5014
OL2000 You Receive an Error Message When You Save an Appointment Item in the Calendar View		9.0.0.5121
Multipurpose hotfix	See: HTML Messages with Pictures Do Not Print Correctly After You Install Internet Explorer 5.5 SP1 or 6.0 OL2000 Access Violation Occurs When a Delegate Updates a Meeting Without Access to a Contacts Folder	9.0.0.5205
Multipurpose hotfix	See: OL2000 Invalid Parameter Error Message When You Post an Item with an Attachment OL2000 Outlook Stops Responding if You Send a Message to Three or More Personal Distribution Lists from Your Contacts Folder	9.0.0.5318
OL2000 Cannot Save Multiple Attachments to Long Paths		9.0.0.5331
Multipurpose hotfix	See: OL2000: Fields Are Empty When You Set the Internet E-mail Service as User-Defined OL2000- The French (Canadian) Version of Outlook Does Not Display the Correct Tasks View OL2000- You Cannot Receive New E-mail Notifications OL2000 (IMO) IMAP Header View Does Not Contain To and Sent Fields	9.0.0.5414
You Cannot Receive New E-mail Notifications in Environments That Use the Network Address Translation	Adds support for registry entries that force Outlook to use polling to check for new messages on the Exchange Server, rather than waiting for UDP packets.	9.0.0.5505
Cannot Find Recipients Certificates Fix	Resolves a problem with finding digital certificates in Contacts when the profile also contains the Personal Address Book.	9.0.0.5512
Message Appears to Remain in Your Outbox When You Reply	Affects replies to messages in a shared Exchange Server mailbox, if you have the save replies with original message option enabled.	9.0.0.5519
Multi-purpose hotfix	See: Outlook MAPI Message Store Cannot Handle Free Threaded Access When Mspst32.dll Is Used OL2000 Command-Line Parameter -c form name Does Not Work with Turkish Regional Settings OL2000 Outlook Stops Responding (Crash) When You Change a Folder After You Reset the Toolbar	9.0.0.5630
VBA Events May Not Work After Print Preview	Resolves a problem in which Outlook VBA code may not run automatically after a Print Preview operation.	9.0.0.5706
You Cannot Receive New E-mail Notifications	Affects computers using Network Address Translation (NAT). You must add a registry entry to set polling as the method for getting new messages, instead of UDP, which is the default.	9.0.0.5915
OL2000 Message Headers Do Not Synchronize As Expected	Corrects the behavior of Remote Mail against an Exchange mailbox to download only headers.	9.0.0.6006
Forms Cache Refresh Fix	Hotfix to add a registry entry that makes Outlook 2000 try to reload a form from the original published version if it can't open the cached version. The registry fix looks weird, as if it were for Outlook 2002, but Microsoft assures us that it is correct.	9.0.0.6110
OL2000 You Receive a Host not found Error When You Open a URL Link in an RTF or Plain Text Message		9.0.0.6117
Multi-purpose hotfix	See: OL2000 Cannot Access Attachments - adds Level1Remove and Level1Add registry values to control attachment blocking OL2000 The 'Startup' Event Is Not Invoked When You Receive the Tip of the Day at Startup	9.0.0.6221
OL2000 Outlook Stops Responding When You Try to View a Calendar	Hotfix to resolve a problem with CDO and recurring appointments.	9.0.0.6228
OL2000 You Receive an Error Message If You Open a Public Folder That Has an OWA Page As the Default Home Page		9.0.0.6314
OL2000 Contact Distribution Lists Display Incorrectly in Outlook 2000 Running on Windows 98		9.0.0.6328
OL2000 Outlook Stops Responding with 100 Percent CPU If You Change the Language on the Taskbar	Hotfix to resolve a problem with switching languages	9.0.0.6331
OL2000 You May Receive Reminders Later Than You Should	Hotfix to correct inaccurate reminder times.	9.0.0.6418
Multi-purpose hotfix	See: OL You Cannot Quickly Search for Contacts in a Mailbox That Is on a Different Exchange 2000 Information Store OL2000 (IMO) The IMAP Password Is Not Retained in the Same Outlook Session	9.0.0.6425
Microsoft Office 2000 Service Pack 3	Major update adding customizable attachment blocking, better handling of forms cache corruption, and many fixes. All subsequent updates will require SP3.	9.0.0.6627
You receive an error message when you select many Exchange 2000 recipients in Outlook 2000	Fixes an "operation failed" error that may occur when you select many recipients.	9.0.0.6711
Outlook 2000 Update December 18, 2002	Fixes the problem in Outlook 2000 SP3 configured in Internet Mail Only mode where you may see CPU usage by Outlook go as high as 100% or get erratic reminder behavior. Does not update the version number because it fixes only Omi9.dll and Omint.dll. The version of both replaced files should be 5.5.3186.0.	n/a
Multipurpose hotfix	See: OL2000 Cannot Locate the Recurrence Information... Error Message When You Open a Recurring Meeting, Appointment, or Event OL2000 Errors When You Open Meeting Update That Contains Attachments	9.0.0.7017
OL2000 Cannot Display or Save Item Using GetItemFromID	Minor public update to restore functionality to the GetItemFromID method, which SP3 broke.	9.0.0.7119
OL2000 You Receive an Error Message When You Save a File Attachment	Fixes a problem with saving file attachments, which SP3 apparently broke.	9.0.0.7303
OL2000 Last Month of Other Persons Published Free-Busy Information Is Missing	Ensures that Outlook publishes a full 12 months of free/busy information, not 11.	9.0.0.7406
Unable to Update Free-Busy Data Error Message in Outlook 2000	Corrects problem that may occur if public free/busy information is deleted.	9.0.0.7427
OL2000 A Digital Signature Is Not Added to Messages that You Reply to or Forward	Ensures that a digital signature is added to replies and forwards when you have Always Sign turned on.	9.0.0.7518
OL2000 How to Control the Unable to Update Public Free-Busy Data Dialog Box	Adds a Please do not show me this dialog again checkbox to the dialog that appears when Outlook has a problem with background publishing of free/busy information.	9.0.0.7527
OL2000 Category List is Blank	Allows Outlook to support more than 700 categories or about 15,000 characters' worth.	9.0.0.7610
Multipurpose fix	OL2000 Error Message Resource Has Declined Your Meeting Because it Is Recurring OL2000 Spelling Checker Does Not Check the Message Before It Is Sent	9.0.0.7624
OL2000 Unable to Display the Folder Error Message When You Click a Folder Home Page Link	Resolves a problem with certain links on Outlook folder home pages.	9.0.0.7708
OL2000 Shortcut That Is Removed from the Outlook Bar Reappears When You Restart Outlook	Resolves an issue related to remove Outlook Bar shortcuts programmatically.	9.0.0.7722
Outlook 2000 Post-Service Pack 3 Hotfix Rollup Package June 7, 2003	Includes all the above post-SP3 fixes, plus other post-SP3 fixes listed under Other Updates below, plus: OL2000 Voting Buttons Are Missing from E-mail Messages That Are Opened on a DMS E-mail System OL2000 You Receive a Non-Delivery Report When Outlook 2000 Improperly Formats MDBEF Encoding	9.0.0.7805
Outlook 2000 Post-Service Pack 3 Hotfix Rollup Package June 16, 2003	Includes all the above post-SP3 fixes, plus other post-SP3 fixes listed under Other Updates below, plus: OL2000 Outlook Quits When Rule Searches for a Specific Word in the Subject or Body of Received Message	9.0.0.7812
Outlook 2000 Post-Service Pack 3 Hotfix Rollup Package July3, 2003	Includes all the above post-SP3 fixes, plus other post-SP3 fixes listed under Other Updates below, plus: OL2000 Cannot Open iCalendar Format (.ics) File	9.0.0.7826

Changes to Outllib.dll should be cumulative. However, patches often update other files as well. Just because you've installed the Delegate Meeting Request Fix doesn't mean that you have the complete Email Attachment Security Update. If you don't remember whether you've installed all the patches, it doesn't hurt to install them again. Just make sure that you respond No when the setup program asks whether you want to replace the systems' current version of Outllib.dll or Outllibr.dll with an older version.

Patches

Installing these patches does not affect the Outlook version number:

CDO Security Update	Updates the Collaboration Data Objects programming interface with the same level of automation security as in the Outlook E-mail Security update.
CDO Offline Synchronization Flag fix	Post SR-1 fix for Emsmdb32.dll to fix an error that may occur when a developer uses CDO to set a folder for offline synchronization. Included in SP2
Defense Messaging System Hoftix	Replaces the Emsmdb32.dll file to avoid a security prompt in Outlook 2000 with the Email Security Update. You can also solve this problem by adding a registry key.
GAL Contact Patch	Fixes a problem that occurs when you add a Global Address List entry to Contacts and the name has an initial in it.
HTML Mail Vulnerability Updates	Critical updates for Microsoft Internet Explorer to prevent harmful worms from entering your system via HTML-format messages.
OL2000 Outlook Sends HTML Messages to the Internet When You Use an Exchange 2000 Mailbox	Hotfix for Exchange 2000 users who are sending text or rich-text, but recipients are getting HTML. Replaces Outlmime.dll.
IMAP Folder Switch Patch	Replaces the Pstprx32.dll file to fix a problem where Outlook stops responding if you switch quickly between IMAP folders.
IMAP Thread Contention Fix	Hotfix to replace the Omint.dll and Omi9.dll files to fix an error that may occur when you access moderately populated IMAP folders.
Java Permissions Security Update	Tightens Java security to prevent malicious Java code from running in an HTML message. Requires the Outlook E-mail Security Patch or Office 2000 SP-2. If you don't want to install SP-2, you can update the security settings manually by following the instructions in the article OL2000 Outlook Update for Java Permissions Security.
Outlook 97 RTF Compatibility Fix	Provides better handling in Outlook 2000 for rich-text messages sent from Outlook 97. Included in SP3.
Outlook 2000 SR-1 Update View Control Security	Update to the Outlook View Control used in Team Folders and digital dashboards to cure a significant security vulnerability. Requires Office 2000 SR-1/1a. Also see OL Developer Information About the Outlook View Control Security Update, and note that the changes do not affect how the OVC operates in an Outlook folder home page.
Update for "Malformed Header" and "Cache Bypass" vulnerabilities	Update your system to protect Outlook against a vulnerability that can allow malicious code to enter your system, even if you do not open or preview the message. The update also eliminates a vulnerability that could allow someone else to read certain files on your system. See MS00-043 - Patch Available for “Malformed E-mail Header” Vulnerability and MS00-046 - Patch Available for “Cache Bypass” Vulnerability. All versions of Outlook are vulnerable, unless you use Outlook only to connect to an Exchange Server mailbox. You have several patch options, depending on your system: Install Internet Explorer 5.5, except on Windows 2000. On Windows 2000, install Internet Explorer 5.01 SP1, available via Windows Update. Windows 2000 SP1 also apparently resolves this issue. If you are already using Outlook Express 5.01, install the separate Security Update. To check your OE version, start OE, and choose Help \| About Microsoft Outlook Express. If the version is 5.00.2919.6600 or, for Windows 2000, 5.00.2919.6700, you have Outlook Express 5.01. (Outlook Express 5.5 includes this update.) If you are using Outlook Express 4.01 SP2, you can download and install the separate Security Update.
UPN Exchange Logon Fix	Hotfix to replace Emsui32.dll and correct a problem with UPN (user@domain.dom) logons not working with Exchange 2000.
User-defined Character Set Fix	Hotfix for users seeing empty To, Cc and Bcc fields on messages received via the Internet whose character sets are set as user-defined. Replaces Outlmime.dll and Pstprx32.dll.
Word 2000 SR-1 Update Mail Command Security	Blocks possible unauthorized sending of messages through the plain text or HTML WordMail or "Office envelope" feature.
OL2000 Attachment to Signed E-Mail Message Is Missing When You Send the Message to a Public Folder	Updates Exsec32.dll to fix a problem with attachments in digitally signed messages in Exchange public folders.
OL2000 Could Not Complete the Operation... Error Message When You Click Reply	Patches Cdo.dll and other files to fix a problem with mail programs that use MAPI to display messages. Requires Office 2000 SP3.
OFF2000 Office 2000 Prompts You to Register After April 15, 2003	Replaces the Mso9.dll to correct a problem where, on April 15, 2003, some installations of Office 2000 began prompting users to register whenever they use Outlook or any other Office program.
OL2000 Outlook Quits with Error Message in Fm20.dll When Sending E-mail Using a Custom Form	Post SP3 fix to replaces Fm20.dll and fix a problem with combo boxes on custom forms.
OL2000 You Cannot Change Your Password When the You Log On to a Non-Exchange Domain in Outlook 2000	Replaces various files to fix a problem with the password dialog. Requires Office 2000 SP3.

Known Problems

If you install Outlook 2000, but use Word 97 as your e-mail editor, when you forward a message with an attachment, the attachment is stripped. Either don't use Word as your e-mail editor or upgrade to Word or Office 2000.

Installing the free Outlook 2000 standalone version for Exchange Server users, then later installing Office 2000 apparently causes problems such as losing forwarded attachments. If you're going to install Office 2000, remove Outlook 2000 first.