<div>
Many thanks Jared. &nbsp;That did the trick!
</div>


<div>
<div class="content wysiwyg-content">
My SBS 2008 server has started reporting the following event error every few hours.<br />
<br />
Volume Shadow Copy Service error: Unexpected error calling routine ConvertStringSidToSid. hr = 0x80070539. Operation: OnIdentify event Gathering Writer Data Context: Execution Context: Shadow Copy Optimization Writer Writer Class Id: {4dc3bdd4-ab48-4d07-adb0-3<wbr />bee2926fd7<wbr />f} Writer Name: Shadow Copy Optimization Writer Writer Instance ID: {1ffa5ff7-93ab-47f0-aaf9-2<wbr />ce44e9d436<wbr />b}<br />
<br />
Any suggestions on correcting this problem?
</div>
</div>


My SBS 2008 server has started reporting the following event error every few hours.

Volume Shadow Copy Service error: Unexpected error calling routine ConvertStringSidToSid. hr = 0x80070539. Operation: OnIdentify event Gathering Writer Data Context: Execution Context: Shadow Copy Optimization Writer Writer Class Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f} Writer Name: Shadow Copy Optimization Writer Writer Instance ID: {1ffa5ff7-93ab-47f0-aaf9-2ce44e9d436b}

Any suggestions on correcting this problem?

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

VSS