Our correspondent Jane Standley says an atmosphere of tension in Harare has overshadowed the occasion.
It is even bigger than other events that overshadowed tech and business talk this week.
Those issues will be overshadowed by the need avoid a new front in the Iraq war.
The predicted deceleration overshadowed another stellar performance during the first three months of the year.
Eaton's performance overshadowed two finals that followed, including some controversy in the women's 100 meters.
However, these stories of triumph are often overshadowed by other stories of a more gruesome nature.
Overshadowed by all of these are the other issues struggling for a moment in the sun.
Cuban may be steamed to find out that he was overshadowed (and that he overpaid).
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Even though both companies beat profit expectations, declining print revenues overshadowed rising online advertising revenues.
Dwindling sales in 2010 were overshadowed by the margin expansion, according to the investor response.
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But for those without any financial reserves, the anguish is often overshadowed by their money fears.
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But corporate good works receive little press and moreover are overshadowed by Microsoft's intensely competitive streak.
He said the organisers regretted what happened and that it had overshadowed a very important discussion.
People in Grenada are voting in a general election overshadowed by an economic crisis.
Exeter University's Guild of Students said the image of the Safer Sex Ball had been "overshadowed".
But that has been overshadowed by Ryanair focusing traffic from north and central Europe on Edinburgh.
"These solid results were overshadowed by unacceptable execution in Enterprise Servers and Storage, " she said.
To the bitter end, the bad-tempered Abuja summit was completely overshadowed by the Zimbabwe crisis.
The scandal overshadowed Thomas Dodd's re-election bid three years later, and he lost his seat.
But that is overshadowed by the damage from sharp falls in Japanese imports, tourism and investments.
BosniaThe budget debate may be overshadowed by the prospects of sending United States troops to Bosnia.
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Democratic vice presidential nominee Joe Biden has been overshadowed so far by his Republican rivals.
His third term was overshadowed by municipal corruption scandals, though Mr. Koch wasn't directly implicated.
However good its intentions, the report will now be overshadowed by the federal government's intervention.
Whether intentionally or not, he has been overshadowed by Iran's presidents, even before Mr Ahmadinejad.
He has been overshadowed by compatriot Ben Harradine , who heads the Commonwealth discus rankings.
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That debt pile overshadowed everything he did and will not disappear now that he has gone.
The Android based handset has been overshadowed by the steamroller of the Samsung Galaxy S3.
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Overshadowed by the soda ban are a slew of other recommendations from the city's obesity task force.
But Syria suddenly has emerged so prominently that it overshadowed Iran during Hagel's three days in Israel.
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