System Attendant won't start [Urgent]

Running Exchange 2007 SP2 on Windows 2008 SP2. Clients are OWA and Outlook 2007.

The System Attendant won't start on my server. In the Event Log, I see Access Denied messages.

Questions -

1. What effect will this have on clients?

2. Will rebooting the server resolve this?

3.
gnoble1979Asked:
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Viral RathodConnect With a Mentor ConsultantCommented:
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Viral RathodConsultantCommented:
If System Attendant is down then your exchnage is completly down , No user will able to login and use.

Have you disabled IPv6 ,if so then please enable and then try to start the System Attendant service,

Hope this helps.
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Viral RathodConsultantCommented:
Can you post the EVent viewer errors ? ,also make sure your DNS is working fine.
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gnoble1979Author Commented:
Hi

I thought the System Attendant wasn't as powerful in Exchange 2007 as it was in 2003? The description on the server also says that it provides directory looks for legacy clients, free/busy for legacy clients etc? What is exactly a legacy client? And will this affect clients running Outlook 2007 or OWA?

A reboot fixed it, but I'm curious to know the duties of this service.
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