* Q1 rev beat estimates by $10 mln
* Raises share buyback program
* Q1 adj shr beat estimates by 1 cent
* Sees FY rev flat; Q2 rev flat to slightly down
April 29 (Reuters) - Infrastructure software maker CitrixSystems Inc (CTXS.O) posted a quarterly profit largely in-linewith estimates, while revenue beat market expectations by ahealthy margin, and it increased its share repurchase programby $300 million.



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