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Cannot reply to multiple senders and accept shared callendar in Outlook 2010.

The Error message is:

Outlook must be online or connected to complete this action.

It is online and I can reply to a single sender. Server is Exchange 2003. And of course I can reply to multiple senders in OWA, so it is not server problem.

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Try redownloading the address book. It seems like Outlook 2010 is more prone to corruption.

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Looks like you found the source of the problem. I cannot download Global Address Book. I would greatly appreciate if you could help me. – alex Aug 4 '10 at 13:38
Try... "Send/Receive" tab and then "Download Address Book..." from the "Send/Receive Groups" pull-down... – user48838 Aug 5 '10 at 21:15
Also delete the .OST and start over with a new one as needed. – user48838 Aug 10 '10 at 17:13

I would delete all offline files or run this command at a command prompt:

del "%APPDATA%\Microsoft\Outlook\*.ost"

It will delete the offline files. Like user48838 said above, Outlook is prone to corruption of these files and it causes a lot of issues.

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