some more options
If it's the motherboard battery on it's way out then it should lose time at a fixed rate. If you leave it on for 2 days is it then 20 hours behind??
If not then it's likely to be synching it's time from an incorrect source. As tomsk100 pointed out it could be a server but i have also seen this happen when a mobile device such as a blackberry or iphone has been connected and synchronised with the PC.
How to minimise the risk of exchange server failure
We run Exchange 2003. I've never had to restore but i'm sure the day will come and it's not something i'm looking forward to as i believe it's a complex process
In order to minimise the risk i would suggest using the following measures:
1. Run exchange on a dedicated member server with only the bare minimum (anti, virus, anti spam) 3rd party products.
2. Always have a hardware warranty on your exhange server and look to replace it every 3 years if you can afford to do so to minimise the chance of hardware failure. Also, when purchasing a new exchange server go for one with a degree of hard drive redundancy (Raid 1 or Raid 5).
3. Configure all your Outlook clients to use cached exchange mode. If your exchange server goes offline then they will still have access to their mailbox. Without cached exhange mode they will have nothing.
4. Investigate using a free basic mailserver that can be quickly set up to pick up email if exchange is offline. There are many on the market however the one we use is Hmail. Our isp forwards our email to our exchange server via SMTP. If our exchange dies we have no other means to get our email as our ISP does not offer a POP redirect. However if we have a fallback server we can re-configure our firewall to send all incoming email to it and then distribute the emails manually until the exchange is back up and running. Not ideal but it's free and would work as a stop gap.
Hope this helps!
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