Hi Peter

I use Excel in Microsoft Office for Mac 2011 with High Sierra without problems. 
Google and (RoaringApps) also claim Office 2011 is compatible with Mojave (!!). 
 I very occasionally use Word and it seems to be ok too.  You can check Office 
and Adobe compatibility at:  http://roaringapps.com/apps:table

I have no info about installing an old OS.  Apple Support suggests that the 
latest version of OSX (10.6) would be reinstalled in Recovery mode if the 
latest installed version on the MBP is in the 10.6 series.

Cheers
Alan


> On 26 Dec 2018, at 6:23 pm, Peter Faulks <[email protected]> wrote:
> 
> My son want to update his Mac Book Pro Lap Top mac but I have told him High 
> Sierra will not accept his Microsoft Office or Adobe suite, mail etc. (Am I 
> right in this?)
> 
> Is it possible to install a previous operating system like 10.6.8 on his 
> machine without having to upgrade to High Sierra? He wants to re install for 
> his boys to use for school work and has OS 10.6 at the moment.
> 
> Peter Faulks
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> Peter & Irene Faulks
> Unit 1, 9 Newsam Close
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> 
> 
> 
> 
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