For now, just stick with the versions you already have...
And plan a slow transition to open source, don't throw everything out over night but ensure any new systems you implement are cross platform (eg web based and work on any browser).
If you plan it well, a slow gradual transition away from ms needn't be too painful or expensive... There's no point ditching what you've already bought and paid for, but similarly no point in getting yourself more locked in...
Most systems get refreshed after a few years anyway, so if you require that any new systems you deploy must be cross platform compatible then it won't be too long before the windows-specific business apps are rotated out anyway.
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Plan long term
For now, just stick with the versions you already have...
And plan a slow transition to open source, don't throw everything out over night but ensure any new systems you implement are cross platform (eg web based and work on any browser).
If you plan it well, a slow gradual transition away from ms needn't be too painful or expensive... There's no point ditching what you've already bought and paid for, but similarly no point in getting yourself more locked in...
Most systems get refreshed after a few years anyway, so if you require that any new systems you deploy must be cross platform compatible then it won't be too long before the windows-specific business apps are rotated out anyway.