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I assume you are running Microsoft Exchange Server? &nbsp;Have a look:<br />
<br />
<a href="http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/ArticleID/24790/24790.html" rel="ugc">http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/ArticleID/24790/24790.html</a><br />
<a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;821411" rel="ugc">http://support.microsoft.com/default.aspx?scid=kb;en-us;821411</a><br />
<a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;q322125" rel="ugc">http://support.microsoft.com/default.aspx?scid=kb;en-us;q322125</a><br />

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I assume you are running Microsoft Exchange Server?  Have a look:

http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/ArticleID/24790/24790.html [http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/ArticleID/24790/24790.html]
http://support.microsoft.com/default.aspx?scid=kb;en-us;821411 [http://support.microsoft.com/default.aspx?scid=kb;en-us;821411]
http://support.microsoft.com/default.aspx?scid=kb;en-us;q322125 [http://support.microsoft.com/default.aspx?scid=kb;en-us;q322125]


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Thank you for your quick response. 
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When I look at performance in nt task manager, I see the physical memory is 1GB and the commit charge at 1.2GB. Then I look at processes and I see that store.exe is using 870MB of memory and taking a lot of cpu time. What is store.exe and why is it using so much resources, and how can I optimize the system? &nbsp;Thanks..
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When I look at performance in nt task manager, I see the physical memory is 1GB and the commit charge at 1.2GB. Then I look at processes and I see that store.exe is using 870MB of memory and taking a lot of cpu time. What is store.exe and why is it using so much resources, and how can I optimize the system?  Thanks..

store.exe

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.