re: Things you need to know about “The connection to the Microsoft Exchange server in unavailable. Outlook must be online or connected to complete this action” prompts in an Outlook 2003–Exchange 2010 world

Kovaiselvan Jayaraman [MSFT] — Tue, 26 Apr 2011 15:09:34 GMT

The KB article you referred has all the initial pointers to look at. You might need to verify on those lines at the time of the issue. I'll start looking at things in this KB , server side event logs to see anything interesting going on at the time of the issue.

re: Things you need to know about “The connection to the Microsoft Exchange server in unavailable. Outlook must be online or connected to complete this action” prompts in an Outlook 2003–Exchange 2010 world

EvilcD — Thu, 07 Apr 2011 08:33:32 GMT

Hallo - Fantastic Article - thanks very much for publishing not only the end result but also the steps taken to get there .

I have an issue along similar lines with Outlook 2003 users on exchange 2010 SP1 ( no roll ups) intermittently ( once a day) getting an error stating " your administrator has blocked your version of outlook " .

Much like KB Article - support.microsoft.com/.../924625

Exchange 2010 --CAS Array on NLB - to two mailbox servers in a DAG . Public folders are replicated from 2003 environment which is still active.

Issue is intermittent in that there are times when it works with no issue and Outlook 2003 can update free/busy and OAB data for users.

It then stops working for a period of time ( half hour ) and pushes out the error. It will then work again after this period of time .

Any help appreciated please in understanding the nature of this issue.