Connection to the Microsoft Exchange Server is unavailable

Asked By 20 points N/A Posted on -

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?
Best Answer by Taylor B Campos
Best Answer
Best Answer
Answered By 90 points N/A #172702

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


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


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

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