Okay, thanks to RD's issue references, I went back and looked at Uncanny X-Men's availability for those ranges -- Dark Phoenix is there in its entirety, but the Brood arc he mentions is in a hole in the current availability (skips from #153 to #167).
I've run into a few of these gaps much more recently using the subscription to catch up on some of my backlog (since it's easier than digging issues out, particularly since I have a lot of sorting to do for the past 3 years or so's worth). So I'm not sure what the rhyme or reason is as far as what causes the holes.
Said holes are, for the most part, the exception rather than the rule, particularly for popular and/or recent series. The start and most recent parts of the run tend to be the most complete.
Since I've got Uncanny X-Men up on the screen, I'll use it as an example. #544 is the most recent issue, and is the final one for the title sometime last year, IIRC (part of the Marvel Now initiative to create good startup points for the most popular titles across the Marvel U, playing mix-and-match with the Marvel standby "Adjective / Team or Superhero Name" format. Like I said, I'm behind on my Marvel, so I'm not sure, but I think it swapped with Spider-Man to become the Amazing X-Men. In any event, in the first 183 issues, Marvel Unlimited is missing 51 issues in 4 contiguous sections, and the most recent 118 issues (almost a decade of publishing) have no gaps at all. Now, Uncanny X-Men is also a good barometer for this because, not only is it popular, but it's one of the few titles that Marvel has been publishing continuously, rather than creating new volumes with relaunched numbering or terminating it in favor of a different title with the same characters. (For the record, DC is more often better than Marvel on this score -- ask Khross how high the Batman issue numbering goes...) The site is reporting 333 issues present out of those 544 that comprise 45 years of monthly comics since 1963 (hmm. Which indicates that there must have been a hiatus somewhere; I thought Uncanny had avoided that. Probably during the original X-Factor days or something.) In any event, this shows how the overall record's pretty decent, but has room for improvement -- over 60% of the issues are digitized. The middle third accounts for the bulk of those missing issues, and would appear to fall into the 184-332 range.
_________________ "Aaaah! Emotions are weird!" - Amdee "... Mirrorshades prevent the forces of normalcy from realizing that one is crazed and possibly dangerous. They are the symbol of the sun-staring visionary, the biker, the rocker, the policeman, and similar outlaws." - Bruce Sterling, preface to Mirrorshades
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