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Check the links below. You should be able to adapt it for your needs.<br />
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<a href="https://www.simple-talk.com/sysadmin/powershell/disk-space-monitoring-and-early-warning-with-powershell/" rel="ugc">https://www.simple-talk.com/sysadmin/powershell/disk-space-monitoring-and-early-warning-with-powershell/</a><br />
<br />
<a href="http://gallery.technet.microsoft.com/scriptcenter/Disk-Space-Report-Reports-98e64d65" rel="ugc nofollow">http://gallery.technet.microsoft.com/scriptcenter/Disk-Space-Report-Reports-98e64d65</a>
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Check the links below. You should be able to adapt it for your needs.

https://www.simple-talk.com/sysadmin/powershell/disk-space-monitoring-and-early-warning-with-powershell/ [https://www.simple-talk.com/sysadmin/powershell/disk-space-monitoring-and-early-warning-with-powershell/]

http://gallery.technet.microsoft.com/scriptcenter/Disk-Space-Report-Reports-98e64d65 [http://gallery.technet.microsoft.com/scriptcenter/Disk-Space-Report-Reports-98e64d65]

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Can you confirm your server OS please?<br />
<br />
Some of the SBS products have the monitoring thresholds built in.
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Can you confirm your server OS please?

Some of the SBS products have the monitoring thresholds built in.

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How can I implement a message that may be sent by email when the server have eg. only 20 GB of available disk space.
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How can I implement a message that may be sent by email when the server have eg. only 20 GB of available disk space.

Warning when disk space reaches a certain threshold

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).

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.