Windows Domain with Windows 7 Professional desktops - enforcing USB drive encryption by default

All - Windows domain with Windows 7 clients and trying to determine the way forward in enforcing USB drive encryption by default across our network, unfortunately we don't have Bit-Locker so will need to look at other solutions - would welcome any advice/tips - thanks.
David NewmanAsked:
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David Johnson, CD, MVPOwnerCommented:
you can't enforce what what you don't have
David NewmanAuthor Commented:
Thanks David - any recommended third party solutions?
David Johnson, CD, MVPOwnerCommented:
other than bitlocker (recommended) Symantec Endpoint Encryption

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We have some kind of a solution.

We bought Sandisk USB thumbdrives for anyone (they are cheap). Those come with a free encryption software. To enforce its usage, we deployed a scheduled task that sends e-mails to the admins and shows warning popups, whenever unencrypted writes to disk take place. This was made possible by windows 8 auditing, which can be used to audit removable devices in general.

Edit: no, windows 7 does not have this, but I am writing because win10 upgrades are free for win7 pro and it will be made available this summer.
Lee W, MVPTechnology and Business Process AdvisorCommented:

Or Upgrade to windows 7 Enterprise (but that will leave you ineligible for Win 10 free upgrades unless you buy Software Assurance too).

Basically, if you can be patient, then it shouldn't cost much in licensing (if anything).  If you need it now, you're ALMOST wasting money but have plenty of options (Personally, I won't buy a Symantec product due to a history of poor products/support).
David NewmanAuthor Commented:
thanks guys
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