Linux and open source is used by numerous organizations as a preferred alternative to proprietary choices:

Proprietary Choice Open source choice Open Source Advantages
in addition to cost savings, etc.
Microsoft Windows file server ("shares") SAMBA Samba has excellent performance - often better than Microsoft servers. Result: Samba can be run on less powerful hardware to support a larger number of users with better performance.
Proprietary databases mysql Mysql has the best performance of all databases.
Microsoft IIS web server Apache web server Most widely used, stable web server. Runs on all platforms.
Microsoft Active Server Pages PHP Very powerful, widely used.

Microsoft Exchange Alternatives:

On the desktop, there are many alternatives to proprietary software as discussed here.

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