We have several internal wikis that we maintain.  We write extensions to these 
wikis.  We are trying to convince management to upgrade our mediaWiki version 
to 1.23.x.  At the same time we will upgrade our PHP version from 5.2.8 to 
5.4.x.  We have kept our PHP version to 5.2 because of the old mediaWiki 
version.

We are currently at mediaWiki 1.15.3.  As developers we know that we are way 
overdue on upgrading, but no one has ever wanted to pay for it.

Some of the obvious things are:

1.       Both the Media wiki version  and the php version are no longer 
supported.

2.       We do not have access to the most recent extensions.

3.       Limited documentation for the old versions.

4.       General security vulnerabilities. - I would love to have any specifics 
here.

Does anyone have any other points that I could add that would make management 
say yes?  We have been reading about performance boasts.  Any specifics?

I would also take any links that may be helpful.

Thanks,

Mary

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