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Cannot connect to Exchange from Outlook

All of a sudden, today, April 1st, none of the Windows workstations in our office can connect to the Exchange Server. When opening Outlook on the workstations we get the message: "Unable to open your default e-mail folders. The Microsoft Exchange Server computer is not available. Either there are network problems ot the Microsoft Exchange Server computer is down for maintenance."

Neither suggestion is true. Workstations can use Remote Desktop to connect to the Exchange Server (which is also the Domain Server) and the Exchange Server computer is definitely up. Interestingly, We have a Linux web host on the domain LAN that uses the Exchange server as a smart host. Email sent from the Linux server, routed through the Exchange server, does reach recipients outside the domain! But domain users cannot connect to Exchange.

On the Exchange server, in the Exchange Shell, I tried restarting Exchange via:

Test-ServiceHealth | Select-Object -Expand ServicesNotRunning | Start-Service

and got:

WARNING: Waiting for service 'Microsoft Exchange Information Store
(MSExchangeIS)' to finish starting...
WARNING: Waiting for service 'Microsoft Exchange Information Store
(MSExchangeIS)' to finish starting...
Start-Service : Service 'Microsoft Exchange Information Store (MSExchangeIS)' start failed.
At line:1 char:78
+ Test-ServiceHealth | Select-Object -Expand ServicesNotRunning | Start-Service
 <<<<
    + CategoryInfo          : OpenError: (System.ServiceProcess.ServiceController:ServiceController) [Start-Service], ServiceCommandException
    + FullyQualifiedErrorId : StartServiceFailed,Microsoft.PowerShell.Commands
   .StartServiceCommand

Start-Service : Service 'Microsoft Exchange EdgeSync (MSExchangeEdgeSync)' cannot be started due to the following error: Cannot start service MSExchangeEdgeSy
nc on computer '.'.
At line:1 char:78
+ Test-ServiceHealth | Select-Object -Expand ServicesNotRunning | Start-Service
 <<<<
    + CategoryInfo          : OpenError: (System.ServiceProcess.ServiceController:ServiceController) [Start-Service], ServiceCommandException
    + FullyQualifiedErrorId : CouldNotStartService,Microsoft.PowerShell.Commands.StartServiceCommand

I also tried stopping all Exchange services and restarting one at a time. When I got to:

Start-Service MSExchangeEdgeSync

I got the error:

Start-Service : Service 'Microsoft Exchange EdgeSync (MSExchangeEdgeSync)' cannot be started due to the following error: Cannot start service MSExchangeEdgeSync on computer '.'.
At line:1 char:14
+ Start-Service <<<<  MSExchangeEdgeSync
    + CategoryInfo          : OpenError: (System.ServiceProcess.ServiceController:ServiceController) [Start-Service], ServiceCommandException
    + FullyQualifiedErrorId : CouldNotStartService,Microsoft.PowerShell.Commands.StartServiceCommand

Does anyone know what is going on? This is rather urgent because the office relies on email for day-to-day business.

We are using Exchange 2007 and SBS Server 2008. Workstaiton Outlooks are mostly Outlook 2010, some 2007 and one 2003.

Urgent!
SOLUTION
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Manpreet SIngh Khatra
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Mark

ASKER

Exchange9 et al, thanks for your responses. I did try rebooting, didn't help. I did, however, find the problem. The AVG Anti-virus program's license expired yesterday and apparently it prevented ANY domain member from connecting to Exchange. I uninstalled AVG from the Exchange server and things started working again. I will complain to our AVG contact about this, and I'd like to complain to someone at Microsoft, but that's like spitting into the ocean.
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ASKER

Echang9's suggestion to check AV software was basically the solution, but thanks to all for quick responses.