atw: AND, BUT, or OR as the first word of a sentence

Dear all 

This has been covered here before.   And so, apologies...

Conventional wisdom was that 
  thou must not begin a sentence with _and_, _or_, and _but_. 

I need some guidance and also some authoritative references for  
whether and when it's OK now to use them as the first word of 
a sentence in a:

1)  technical document
2)  casual communication 
3)  formal non-technical writing  

Thanks...
   Paul RETI
   Sydney Australia
     

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