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Yahoo's Carol Bartz began rolling out a new management structure, in moves that will overhaul top executive ranks at the Internet company.

CHICAGO (Reuters) - Yahoo Inc Chief Executive Carol Bartz could announce a major management reorganization as early as next week, most likely on Wednesday, according to the blog AllThingsD.

Last month we reported a potentially important change in search-market share trends: After years of steady decline, Yahoo's domestic share numbers (YHOO) had increased for five months in a row. Well, the good news continued in January, with Yahoo's share jumping a half-point to 21%, per Comscore.

An anemic ad market is expected to depress the Web portal's Q4 earnings.