Many users of Outlook 2003 with mailboxes on an Exchange 2003 Server provided report single or together of the following error messages when they attempted to explore single or many Exchange 2010 user Calendars.
Unable to display the folder. The information store could not be opened.
The connection to the Microsoft Exchange Server is unavailable. The outlook must be online or connected to complete this action.
I personally checked all the computers who are using the outlook, the connection exists but still I see this error why?
Connection to the Microsoft Exchange Server is unavailable
Hi there jonathon P Smith
If the default gateway is not configured in outlook client computer this problem will occur.
So to solve this problem there are two ways.
1st – manual way
2nd – automatic way
1st Method (manual) for outlook 2007
Step 1 – Click Start > Run > type regedit and hit enter and open regedit editor
Step 2 – Locate the following path
HKEY_CURRENT_USERSoftwareMicrosoftOffice12.0OutlookRPC
Step 3 – On the right hand side click right mouse button > New > DWORD Value
Step 4 – Give the name as “DefConnectOpts” and hit enter
Step 5 – Set the value to “0” in value data box the click modify
Step 6 – Exit the regedit editor
Note – if it is for outlook 2010 you need to use this path
HKEY_CURRENT_USERSoftwareMicrosoftOffice14.0OutlookRPC
2nd method
Download this software which provided from Microsoft for overcome this issue
How to use? Download it > install > run the program > done
Hope these answers helps you
Taylor B Campos
Thank You
Connection to the Microsoft Exchange Server is unavailable
Hello Jonathon
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