outlook 2003 opening multiple shared Calendars while connected to Exchange 2010 error

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Mike Donovan

Over the past weekend we migrated our single server exchange environemt to enterprise 2010 and we still have one annoying issue. All of our Outlook Clients are on 2003 sp3 and they can all open anywhere from 2-6 shared calendars depending on the user. Once they hit their arbitrary limit they recieve this error "The Connection to the microsoft exchange server is unavailable. outlook must be online or connected to complete this action." The user then has to close outlook and reopen it before they can open any other calendars, but the number of calendars they can open at once stays the same.

Has anyone else seen this behavior and been able to fix it?


Sembee [MVP]

There is what appears to be a bug with that combination, which I understand from various blogs and online postings is being investigated. Not aware of any resolutions to the issue at the moment, other than a client upgrade.

Microsoft maybe able to give you more information if you log a support call with them.

I have seen so many odd things with Exchange 2010 and Outlook 2003 that I now advise clients to upgrade the clients to at least Outlook 2007 beforehand. This also gives them the full functionality.


Justin McMillen

Hi Mike

I found that increasing the RCAMaxConcurrency value solved my calendar issues. It seems to be that outlook 2003 keeps its RCP connections open until the client is closed causing problems with calendars.

I've detailed the whole process here , hope it helps.


Justin McMillen
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