MW 1.23 is an LTS version, so is still supported. I can patch it up to 1.23.15 to ensure it's secure.
I can also upgrade SMW to 2.2.2. This is a nice stable version.
SMW 3+ requires MW 1.26+. Two issues here:
- MW 1.26 onwards uses a new skinning engine, so some skin rework will be required. Some extensions also no longer work as they changed the way extensions are loaded. I can evaluate what extensions are at risk.
- SMW 3 is pretty new and seems a bit unstable at present. You also have to upgrade all dependent modules - Maps, SRF, PageForms etc.
First thing will be to patch up to MW 1.23.15 and SMW 2.2.2. These versions will keep you going for a good while and are very stable.
I suggest we then build a new separate instance using newer MW and SMW as see if anything breaks.
Are you planning to upgrade the server to Ubuntu 16.04 at some point?
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