Issues that the update rollup fixes
Update Rollup 4 for Exchange Server 2010 RTM fixes the following issues: (Get it here)
- An attachment is not visible when an Exchange Server 2010 user opens a signed mail message by using Outlook 2003
- You cannot send a message to a Dynamic Distribution Group in a mixed Exchange Server 2007 and Exchange Server 2010 environment
- An IMAP4 client crashes when accessing an Exchange Server 2010 mailbox
- An error message is generated in Exchange Server 2010 when you use Exchange Troubleshooting Assistant
- You cannot connect an Exchange Server 2010 mailbox by using a MAPI client
- Event ID 1066 is logged and you cannot move a mailbox from an Exchange Server 2003 server to an Exchange Server 2010 server
- Event ID 4999 and Event ID 7031 are logged when you move a mailbox to an Exchange Server 2010 server
- You cannot replicate a public folder from one Microsoft Exchange Server 2010 server to another, and Event ID 3079 is logged on the target server
- The Add-MailboxDatabaseCopy command fails when it is used to add a database copy to a Database Availability Group in an Exchange Server 2010 environment
- A MAPI application that is used to access Exchange Server 2010 mailboxes crashes when the application accesses an address book
- “MAPI_E_INVALID_PARAMETER” error message when you copy email messages from an Exchange Server 2010 mailbox
- Microsoft Exchange Transport service on an Exchange Server 2010 server crashes when a certain message is processed
- An Exchange Server 2010 mailbox user receives a NDR error message when the user sends an email message to multiple internal users
- The RpcClientAccess process on an Exchange Server 2010 server crashes when you access a mailbox by using a MAPI application
- Error message when you expand the Microsoft Exchange On-Premises node in the EMC of Exchange Server 2010
- Event ID 4033 is logged and the Free/Busy replication from an Exchange Server 2003 server to an Exchange Server 2010 server fails
- Some embedded messages are corrupted when they are contained in a message that is sent from an Exchange Server 2010 mailbox address
- delegate receives only one meeting request when someone sends a meeting request to several principals in an Exchange Server 2010 RU1 or later environment
- The msExchVersion attribute value of a user is stamped incorrectly after you run the Enable-MailUser cmdlet to mail-enable the user
- The .xls file as an attachment is empty when you access an Exchange Server 2010 mailbox by using OWA
- “redirect it to people or distribution list” rule does not work on an Exchange Server 2010 mailbox address
- A user intermittently fails to access an Exchange Server 2010 mailbox after the mailbox is moved

